how to adjust rigidbody settings for lots of objects
Well it was easier then i thought it would be.
I created one example object and named it LikeMe, there i set all rigid body options. Then since all target objects have similair names (alls starting width Icosphere added a * at the end and did a select pattern, finalized width a copy of rigid body settings

import bpy
scene = bpy.context.scene
scene.objects.active = bpy.data.objects["LikeMe"]
bpy.ops.object.select_pattern(pattern="Icosphere*", case_sensitive=True)
bpy.ops.rigidbody.object_settings_copy()